637428 has 36 divisors (see below), whose sum is σ = 1638560. Its totient is φ = 192720.

The previous prime is 637423. The next prime is 637447. The reversal of 637428 is 824736.

It is a junction number, because it is equal to n+sod(n) for n = 637395 and 637404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1233 + ... + 1671.

2⁶³⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 637428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819280).

637428 is an abundant number, since it is smaller than the sum of its proper divisors (1001132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

637428 is a wasteful number, since it uses less digits than its factorization.

637428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 455 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 637428 is about 798.3908817115. The cubic root of 637428 is about 86.0617908190.

The spelling of 637428 in words is "six hundred thirty-seven thousand, four hundred twenty-eight".